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MMZ_TimeLord Everyone has got it nailed... flycut and/or machine the raised side first to level it out... then the cupped side.
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Thanks, especially for the mention of the sequence of which side to do first.
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Just a note about your mill... if you don't have a collet to fit your fly cutter you can use a 3 or 4 flut endmill that is quite wide. ...
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Well I hope to have gotten that taken care of - I just visited one of the local used machine places, and picked up a few things, including a 1/2" collet. (previously my largest was a 3/8") I'll have to double check, but I think my widest 1/2" flycutter will go wide enough to do the block in one pass.
I am getting to really be annoyed with this Smithy mill-drill machine, it seems they don't do anything with standard tooling - The millhead uses MT-3 taper instead of R-8, so finding tooling is either expensive or difficult. (R-8 is one of the major industry standards, and tooling for it is easy to find and comparatively inexpensive.) However I am managing to get my tooling collection built up some, to the point where I might be able to do something useful with it.
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Finally ... lap it for a nice finish. I'm not completely familiar with machining terms... but I have a mill (in storage.. ) that I used on my blocks. The raw copper I got came with the same slight bow to it and that's how I corrected mine.
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I noticed that when I was doing multiple passes before on the cut ends of my blocks that I was getting a line between the passes - I couldn't feel it, but it was very visible - is this normal, and is it something to worry about, or will the lapping get rid of it?